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Pumice ( / ˈpʌmɪs /), called pumicite in its powdered or dust form, is a volcanic rock that consists of extremely vesicular rough-textured volcanic glass, which may or may not contain crystals. It is typically light-colored.
Pumice is a volcanic rock that consists of highly vesicular rough textural rock glass. It generally light colored. It is created when gas-saturated liquid magma erupts like a carbonated drink and cools so rapidly that the resulting foam solidifies into a glass full of gas bubbles.
Pumice is a light-colored, extremely porous igneous rock that forms during explosive volcanic eruptions. It is used as aggregate in lightweight concrete, as landscaping aggregate, and as an abrasive in a variety of industrial and consumer products.
Pumice is an igneous rock that forms when magma suddenly depressurizes and cools. Essentially, pumice is a solid foam. It is light enough to float on water until it becomes waterlogged.
Pumice, a very porous, frothlike volcanic glass that has long been used as an abrasive in cleaning, polishing, and scouring compounds. It is also employed as a lightweight aggregate in precast masonry units, poured concrete, insulation and acoustic tile, and plaster. Pumice is pyroclastic igneous.
Pumice is an extrusive igneous rock composed of highly vesicular volcanic glass, formed from violent eruption, depressurization, and rapid cooling of lava. It is usually lightly colored with a felsic or intermediate composition.
Pumice is a very low-density, form-like, mostly light-colored glassy volcanic rock with a vesicular texture, not a mineral. This rough, porous rock forms from mostly silicic, high-viscosity, volatile-rich lava during an explosive volcanic eruption.
What is Pumice? Pumice doesn’t have a precise definition, instead, it’s applied to rocks that have the same qualities. Because of this, and the variable composition of magma, it’s hard to pin down it’s exact composition. Pumice isn’t considered a mineral, although it may have some minerals within it.
Formed during explosive volcanic eruptions, pumice is a type of igneous rock that emerges when frothy magma cools rapidly, trapping gas bubbles within its structure. As the magma solidifies, it forms a lightweight, porous rock with a distinctive spongy texture.
Pumice - Igneous Rocks. Pumice is a lava froth. This rock type is well known because of its lightness. It usually floats in water because of extreme vesiculation. It is usually light-colored and in most cases corresponds compositionally to rhyolite or dacite. There is a reason for that.